ya i know your series were KOTH. WD blew but 4 corners game was pretty interesting!I am asking in general, because i think its supposed to be "master picks map and sets" and bo7 is played on those sets

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As far as maps go, that is 100% up to the master tag holder who is being challenged. For instance if someone were challenge Swagier for his master tag, Swagier will be the one to set the terms of said challenge (i.e. maps, settings, time, and day)